7 hours ago
There are a few ways for this. One way to try is:
(1) Colors -> Auto -> White Balance ( the connecting lines are very faint and probably will not show on a light background)
(2) Bucket Fill using Affected Area = Fill whole selection Fill Type = FG color Mode = Color erase.
(3) Set the Background (BG) color as required.
(4) Image -> Flatten Image (this replaces any transparency with the BG color)
A 30 second animation of that: https://sendvid.com/msgycwvm
(1) Colors -> Auto -> White Balance ( the connecting lines are very faint and probably will not show on a light background)
(2) Bucket Fill using Affected Area = Fill whole selection Fill Type = FG color Mode = Color erase.
(3) Set the Background (BG) color as required.
(4) Image -> Flatten Image (this replaces any transparency with the BG color)
A 30 second animation of that: https://sendvid.com/msgycwvm